Policyalternatives seem like a potentially useful feature, but it's difficult to come up with a nontrivial working example.
策略替代项似乎是一个很有用的特性，但是要给出一个非凡的运行示例也比较困难。
2
The WS-Policy specification describes the syntax for expressing policyalternatives and for composing them as combinations of domain assertions.
WS - Policy规范描述了表达策略选择及将它们组合为领域声明集合的语法。
3
This paper presents a land suitability evaluation approach for policyalternatives that USES GIS-based multi-criteria evaluation method for master plan.